Service engine soon light - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-20-2006, 09:38 PM   #1
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Default Service engine soon light

The SES light is on. Check engine light isn't on. Would pulling codes uncover the reason for the light being on? Or, is that procedure only to troubleshoot a check engine light?
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Old 03-20-2006, 10:56 PM   #2
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wait a second, the SES is on but not the Check engine light? Is that not the same thing, or do 92-99s have both?
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Old 03-20-2006, 10:59 PM   #3
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Which car? SES and CE lights are one in the same.
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Old 03-21-2006, 09:28 AM   #4
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Quote:
Originally Posted by J Wikoff
Which car? SES and CE lights are one in the same.
92 SSEi. No, the SES, and CE lights are not one in the same on this car.

The check engine light is on the DIC. The SES light is over by the Security light. The SES light stays on while the car is running. The CE light only comes on when you start the car, then goes off with all other system monitor lights on the DIC.

Maybe a picture is in order....
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Old 03-21-2006, 09:35 AM   #5
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Check engine will be any gauge out of range.

SES will be a PCM code. Pull it. I had my yearly code 55 yesterday. Squirt oil on the EGR shafts and springs, good to go.

Might be something simple like that or a disconnected IAT.
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Old 03-21-2006, 09:42 AM   #6
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Quote:
Originally Posted by willwren
Check engine will be any gauge out of range.

SES will be a PCM code. Pull it. I had my yearly code 55 yesterday. Squirt oil on the EGR shafts and springs, good to go.

Might be something simple like that or a disconnected IAT.
I bet it'* a disconnected sensor. That light never came on before I tore apart the upper end. Will pull codes. Thanks!
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Old 03-21-2006, 10:50 AM   #7
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Oooo Ooooo I vote for disconnected sensor. Like that super small vac tube that feeds the maps..
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Old 03-21-2006, 12:01 PM   #8
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92 SSEi has one MAP sensor that provides no faults to the PCM. It'* strictly for boost indication.
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Old 03-21-2006, 02:12 PM   #9
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Killjoy....
I'm still on the electrical sensor or soemthing silly code...
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Old 03-21-2006, 10:23 PM   #10
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Pulled codes. Had a 22 and 58. Reset the PCM (pulled the negative cable for 20 minutes). Was left with a 22. Reseated the TPS wiring harness into the sensor. Reset PCM...still had a 22.

Took off the TPS and reseated it. Seemed that at rest it was still proped open. So, I rotated it full right so that it'* at rest. Hopefully that will solve it. Battery cable is off. Will test again tomorrow.
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